Matrix International Modified 1EB Brakes for Industrial Robots

A leading global industrial robotics manufacturer contacted Matrix to provide servo
motor brakes for a new series of robots used in material handling and process
applications. The robots often operate 16 to 24 hours/day performing rapid repetitive
programmed functions.

The power-off brakes needed to maintain torque during static/holding operations
and occasional E-stop dynamic/stopping engagements if a power failure occurred.
Minimum backlash was also required to prevent the robotic arms from “bouncing”
or “drifting” during precision movements and stops. Less than 1 degree of backlash
movement could cause the robot’s arm to significantly miss its target location, causing
productivity problems and possible damage.

To meet the challenging application requirements, Matrix engineers developed various
sizes of modified spring-applied, electromagnetically-released 1EB Series servo
motor brakes. A special friction material that does not absorb moisture was designed
specifically for this application. The number and type of springs, plating options,
and composite friction materials with low wear rates were evaluated and selected to
achieve the specified braking torque and temperature levels for each motor/brake size.

Extensive testing, with accurate data capture, was conducted in-house on multiple
custom-built, computer-controlled test stands to validate the required performance
characteristics. Per customer request, brake life testing was performed to ensure brake
life would exceed the life expectancy of the robot.